there not like the original cards because these are Egyptian god cards. The color of the back of the card is the same color as the monster like The Winged Dragon of Ra is yellow Obelisk The Tormentor is blue Slyfer The Sky dragon is red if you have these cards some of the many ways you can tell if the card is fake would be the color of the back, the bottom right hand corner has to be gold, it has to be holographic, the name has to be spelled right, and has to say on the bottom left hand side" This card can not be used in a duel"